value.h revision 1.1.1.3
1 /* Definitions for values of C expressions, for GDB. 2 3 Copyright (C) 1986-2015 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20 #if !defined (VALUE_H) 21 #define VALUE_H 1 22 23 #include "doublest.h" 24 #include "frame.h" /* For struct frame_id. */ 25 26 struct block; 27 struct expression; 28 struct regcache; 29 struct symbol; 30 struct type; 31 struct ui_file; 32 struct language_defn; 33 struct value_print_options; 34 struct xmethod_worker; 35 36 /* Values can be partially 'optimized out' and/or 'unavailable'. 37 These are distinct states and have different string representations 38 and related error strings. 39 40 'unavailable' has a specific meaning in this context. It means the 41 value exists in the program (at the machine level), but GDB has no 42 means to get to it. Such a value is normally printed as 43 <unavailable>. Examples of how to end up with an unavailable value 44 would be: 45 46 - We're inspecting a traceframe, and the memory or registers the 47 debug information says the value lives on haven't been collected. 48 49 - We're inspecting a core dump, the memory or registers the debug 50 information says the value lives aren't present in the dump 51 (that is, we have a partial/trimmed core dump, or we don't fully 52 understand/handle the core dump's format). 53 54 - We're doing live debugging, but the debug API has no means to 55 get at where the value lives in the machine, like e.g., ptrace 56 not having access to some register or register set. 57 58 - Any other similar scenario. 59 60 OTOH, "optimized out" is about what the compiler decided to generate 61 (or not generate). A chunk of a value that was optimized out does 62 not actually exist in the program. There's no way to get at it 63 short of compiling the program differently. 64 65 A register that has not been saved in a frame is likewise considered 66 optimized out, except not-saved registers have a different string 67 representation and related error strings. E.g., we'll print them as 68 <not-saved> instead of <optimized out>, as in: 69 70 (gdb) p/x $rax 71 $1 = <not saved> 72 (gdb) info registers rax 73 rax <not saved> 74 75 If the debug info describes a variable as being in such a register, 76 we'll still print the variable as <optimized out>. IOW, <not saved> 77 is reserved for inspecting registers at the machine level. 78 79 When comparing value contents, optimized out chunks, unavailable 80 chunks, and valid contents data are all considered different. See 81 value_contents_eq for more info. 82 */ 83 84 /* The structure which defines the type of a value. It should never 85 be possible for a program lval value to survive over a call to the 86 inferior (i.e. to be put into the history list or an internal 87 variable). */ 88 89 struct value; 90 91 /* Values are stored in a chain, so that they can be deleted easily 92 over calls to the inferior. Values assigned to internal variables, 93 put into the value history or exposed to Python are taken off this 94 list. */ 95 96 struct value *value_next (struct value *); 97 98 /* Type of the value. */ 99 100 extern struct type *value_type (const struct value *); 101 102 /* This is being used to change the type of an existing value, that 103 code should instead be creating a new value with the changed type 104 (but possibly shared content). */ 105 106 extern void deprecated_set_value_type (struct value *value, 107 struct type *type); 108 109 /* Only used for bitfields; number of bits contained in them. */ 110 111 extern int value_bitsize (const struct value *); 112 extern void set_value_bitsize (struct value *, int bit); 113 114 /* Only used for bitfields; position of start of field. For 115 gdbarch_bits_big_endian=0 targets, it is the position of the LSB. For 116 gdbarch_bits_big_endian=1 targets, it is the position of the MSB. */ 117 118 extern int value_bitpos (const struct value *); 119 extern void set_value_bitpos (struct value *, int bit); 120 121 /* Only used for bitfields; the containing value. This allows a 122 single read from the target when displaying multiple 123 bitfields. */ 124 125 struct value *value_parent (struct value *); 126 extern void set_value_parent (struct value *value, struct value *parent); 127 128 /* Describes offset of a value within lval of a structure in bytes. 129 If lval == lval_memory, this is an offset to the address. If lval 130 == lval_register, this is a further offset from location.address 131 within the registers structure. Note also the member 132 embedded_offset below. */ 133 134 extern int value_offset (const struct value *); 135 extern void set_value_offset (struct value *, int offset); 136 137 /* The comment from "struct value" reads: ``Is it modifiable? Only 138 relevant if lval != not_lval.''. Shouldn't the value instead be 139 not_lval and be done with it? */ 140 141 extern int deprecated_value_modifiable (struct value *value); 142 143 /* If a value represents a C++ object, then the `type' field gives the 144 object's compile-time type. If the object actually belongs to some 145 class derived from `type', perhaps with other base classes and 146 additional members, then `type' is just a subobject of the real 147 thing, and the full object is probably larger than `type' would 148 suggest. 149 150 If `type' is a dynamic class (i.e. one with a vtable), then GDB can 151 actually determine the object's run-time type by looking at the 152 run-time type information in the vtable. When this information is 153 available, we may elect to read in the entire object, for several 154 reasons: 155 156 - When printing the value, the user would probably rather see the 157 full object, not just the limited portion apparent from the 158 compile-time type. 159 160 - If `type' has virtual base classes, then even printing `type' 161 alone may require reaching outside the `type' portion of the 162 object to wherever the virtual base class has been stored. 163 164 When we store the entire object, `enclosing_type' is the run-time 165 type -- the complete object -- and `embedded_offset' is the offset 166 of `type' within that larger type, in bytes. The value_contents() 167 macro takes `embedded_offset' into account, so most GDB code 168 continues to see the `type' portion of the value, just as the 169 inferior would. 170 171 If `type' is a pointer to an object, then `enclosing_type' is a 172 pointer to the object's run-time type, and `pointed_to_offset' is 173 the offset in bytes from the full object to the pointed-to object 174 -- that is, the value `embedded_offset' would have if we followed 175 the pointer and fetched the complete object. (I don't really see 176 the point. Why not just determine the run-time type when you 177 indirect, and avoid the special case? The contents don't matter 178 until you indirect anyway.) 179 180 If we're not doing anything fancy, `enclosing_type' is equal to 181 `type', and `embedded_offset' is zero, so everything works 182 normally. */ 183 184 extern struct type *value_enclosing_type (struct value *); 185 extern void set_value_enclosing_type (struct value *val, 186 struct type *new_type); 187 188 /* Returns value_type or value_enclosing_type depending on 189 value_print_options.objectprint. 190 191 If RESOLVE_SIMPLE_TYPES is 0 the enclosing type will be resolved 192 only for pointers and references, else it will be returned 193 for all the types (e.g. structures). This option is useful 194 to prevent retrieving enclosing type for the base classes fields. 195 196 REAL_TYPE_FOUND is used to inform whether the real type was found 197 (or just static type was used). The NULL may be passed if it is not 198 necessary. */ 199 200 extern struct type *value_actual_type (struct value *value, 201 int resolve_simple_types, 202 int *real_type_found); 203 204 extern int value_pointed_to_offset (struct value *value); 205 extern void set_value_pointed_to_offset (struct value *value, int val); 206 extern int value_embedded_offset (struct value *value); 207 extern void set_value_embedded_offset (struct value *value, int val); 208 209 /* For lval_computed values, this structure holds functions used to 210 retrieve and set the value (or portions of the value). 211 212 For each function, 'V' is the 'this' pointer: an lval_funcs 213 function F may always assume that the V it receives is an 214 lval_computed value, and has F in the appropriate slot of its 215 lval_funcs structure. */ 216 217 struct lval_funcs 218 { 219 /* Fill in VALUE's contents. This is used to "un-lazy" values. If 220 a problem arises in obtaining VALUE's bits, this function should 221 call 'error'. If it is NULL value_fetch_lazy on "un-lazy" 222 non-optimized-out value is an internal error. */ 223 void (*read) (struct value *v); 224 225 /* Handle an assignment TOVAL = FROMVAL by writing the value of 226 FROMVAL to TOVAL's location. The contents of TOVAL have not yet 227 been updated. If a problem arises in doing so, this function 228 should call 'error'. If it is NULL such TOVAL assignment is an error as 229 TOVAL is not considered as an lvalue. */ 230 void (*write) (struct value *toval, struct value *fromval); 231 232 /* If non-NULL, this is used to implement pointer indirection for 233 this value. This method may return NULL, in which case value_ind 234 will fall back to ordinary indirection. */ 235 struct value *(*indirect) (struct value *value); 236 237 /* If non-NULL, this is used to implement reference resolving for 238 this value. This method may return NULL, in which case coerce_ref 239 will fall back to ordinary references resolving. */ 240 struct value *(*coerce_ref) (const struct value *value); 241 242 /* If non-NULL, this is used to determine whether the indicated bits 243 of VALUE are a synthetic pointer. */ 244 int (*check_synthetic_pointer) (const struct value *value, 245 int offset, int length); 246 247 /* Return a duplicate of VALUE's closure, for use in a new value. 248 This may simply return the same closure, if VALUE's is 249 reference-counted or statically allocated. 250 251 This may be NULL, in which case VALUE's closure is re-used in the 252 new value. */ 253 void *(*copy_closure) (const struct value *v); 254 255 /* Drop VALUE's reference to its closure. Maybe this frees the 256 closure; maybe this decrements a reference count; maybe the 257 closure is statically allocated and this does nothing. 258 259 This may be NULL, in which case no action is taken to free 260 VALUE's closure. */ 261 void (*free_closure) (struct value *v); 262 }; 263 264 /* Create a computed lvalue, with type TYPE, function pointers FUNCS, 265 and closure CLOSURE. */ 266 267 extern struct value *allocate_computed_value (struct type *type, 268 const struct lval_funcs *funcs, 269 void *closure); 270 271 /* Helper function to check the validity of some bits of a value. 272 273 If TYPE represents some aggregate type (e.g., a structure), return 1. 274 275 Otherwise, any of the bytes starting at OFFSET and extending for 276 TYPE_LENGTH(TYPE) bytes are invalid, print a message to STREAM and 277 return 0. The checking is done using FUNCS. 278 279 Otherwise, return 1. */ 280 281 extern int valprint_check_validity (struct ui_file *stream, struct type *type, 282 int embedded_offset, 283 const struct value *val); 284 285 extern struct value *allocate_optimized_out_value (struct type *type); 286 287 /* If VALUE is lval_computed, return its lval_funcs structure. */ 288 289 extern const struct lval_funcs *value_computed_funcs (const struct value *); 290 291 /* If VALUE is lval_computed, return its closure. The meaning of the 292 returned value depends on the functions VALUE uses. */ 293 294 extern void *value_computed_closure (const struct value *value); 295 296 /* If zero, contents of this value are in the contents field. If 297 nonzero, contents are in inferior. If the lval field is lval_memory, 298 the contents are in inferior memory at location.address plus offset. 299 The lval field may also be lval_register. 300 301 WARNING: This field is used by the code which handles watchpoints 302 (see breakpoint.c) to decide whether a particular value can be 303 watched by hardware watchpoints. If the lazy flag is set for some 304 member of a value chain, it is assumed that this member of the 305 chain doesn't need to be watched as part of watching the value 306 itself. This is how GDB avoids watching the entire struct or array 307 when the user wants to watch a single struct member or array 308 element. If you ever change the way lazy flag is set and reset, be 309 sure to consider this use as well! */ 310 311 extern int value_lazy (struct value *); 312 extern void set_value_lazy (struct value *value, int val); 313 314 extern int value_stack (struct value *); 315 extern void set_value_stack (struct value *value, int val); 316 317 /* Throw an error complaining that the value has been optimized 318 out. */ 319 320 extern void error_value_optimized_out (void); 321 322 /* value_contents() and value_contents_raw() both return the address 323 of the gdb buffer used to hold a copy of the contents of the lval. 324 value_contents() is used when the contents of the buffer are needed 325 -- it uses value_fetch_lazy() to load the buffer from the process 326 being debugged if it hasn't already been loaded 327 (value_contents_writeable() is used when a writeable but fetched 328 buffer is required).. value_contents_raw() is used when data is 329 being stored into the buffer, or when it is certain that the 330 contents of the buffer are valid. 331 332 Note: The contents pointer is adjusted by the offset required to 333 get to the real subobject, if the value happens to represent 334 something embedded in a larger run-time object. */ 335 336 extern gdb_byte *value_contents_raw (struct value *); 337 338 /* Actual contents of the value. For use of this value; setting it 339 uses the stuff above. Not valid if lazy is nonzero. Target 340 byte-order. We force it to be aligned properly for any possible 341 value. Note that a value therefore extends beyond what is 342 declared here. */ 343 344 extern const gdb_byte *value_contents (struct value *); 345 extern gdb_byte *value_contents_writeable (struct value *); 346 347 /* The ALL variants of the above two macros do not adjust the returned 348 pointer by the embedded_offset value. */ 349 350 extern gdb_byte *value_contents_all_raw (struct value *); 351 extern const gdb_byte *value_contents_all (struct value *); 352 353 /* Like value_contents_all, but does not require that the returned 354 bits be valid. This should only be used in situations where you 355 plan to check the validity manually. */ 356 extern const gdb_byte *value_contents_for_printing (struct value *value); 357 358 /* Like value_contents_for_printing, but accepts a constant value 359 pointer. Unlike value_contents_for_printing however, the pointed 360 value must _not_ be lazy. */ 361 extern const gdb_byte * 362 value_contents_for_printing_const (const struct value *value); 363 364 extern void value_fetch_lazy (struct value *val); 365 366 /* If nonzero, this is the value of a variable which does not actually 367 exist in the program, at least partially. If the value is lazy, 368 this may fetch it now. */ 369 extern int value_optimized_out (struct value *value); 370 371 /* Given a value, return true if any of the contents bits starting at 372 OFFSET and extending for LENGTH bits is optimized out, false 373 otherwise. */ 374 375 extern int value_bits_any_optimized_out (const struct value *value, 376 int bit_offset, int bit_length); 377 378 /* Like value_optimized_out, but return true iff the whole value is 379 optimized out. */ 380 extern int value_entirely_optimized_out (struct value *value); 381 382 /* Mark VALUE's content bytes starting at OFFSET and extending for 383 LENGTH bytes as optimized out. */ 384 385 extern void mark_value_bytes_optimized_out (struct value *value, 386 int offset, int length); 387 388 /* Mark VALUE's content bits starting at OFFSET and extending for 389 LENGTH bits as optimized out. */ 390 391 extern void mark_value_bits_optimized_out (struct value *value, 392 int offset, int length); 393 394 /* Set or return field indicating whether a variable is initialized or 395 not, based on debugging information supplied by the compiler. 396 1 = initialized; 0 = uninitialized. */ 397 extern int value_initialized (struct value *); 398 extern void set_value_initialized (struct value *, int); 399 400 /* Set COMPONENT's location as appropriate for a component of WHOLE 401 --- regardless of what kind of lvalue WHOLE is. */ 402 extern void set_value_component_location (struct value *component, 403 const struct value *whole); 404 405 /* While the following fields are per- VALUE .CONTENT .PIECE (i.e., a 406 single value might have multiple LVALs), this hacked interface is 407 limited to just the first PIECE. Expect further change. */ 408 /* Type of value; either not an lval, or one of the various different 409 possible kinds of lval. */ 410 extern enum lval_type *deprecated_value_lval_hack (struct value *); 411 #define VALUE_LVAL(val) (*deprecated_value_lval_hack (val)) 412 413 /* Like VALUE_LVAL, except the parameter can be const. */ 414 extern enum lval_type value_lval_const (const struct value *value); 415 416 /* If lval == lval_memory, return the address in the inferior. If 417 lval == lval_register, return the byte offset into the registers 418 structure. Otherwise, return 0. The returned address 419 includes the offset, if any. */ 420 extern CORE_ADDR value_address (const struct value *); 421 422 /* Like value_address, except the result does not include value's 423 offset. */ 424 extern CORE_ADDR value_raw_address (struct value *); 425 426 /* Set the address of a value. */ 427 extern void set_value_address (struct value *, CORE_ADDR); 428 429 /* Pointer to internal variable. */ 430 extern struct internalvar **deprecated_value_internalvar_hack (struct value *); 431 #define VALUE_INTERNALVAR(val) (*deprecated_value_internalvar_hack (val)) 432 433 /* Frame register value is relative to. This will be described in the 434 lval enum above as "lval_register". */ 435 extern struct frame_id *deprecated_value_frame_id_hack (struct value *); 436 #define VALUE_FRAME_ID(val) (*deprecated_value_frame_id_hack (val)) 437 438 /* Register number if the value is from a register. */ 439 extern short *deprecated_value_regnum_hack (struct value *); 440 #define VALUE_REGNUM(val) (*deprecated_value_regnum_hack (val)) 441 442 /* Return value after lval_funcs->coerce_ref (after check_typedef). Return 443 NULL if lval_funcs->coerce_ref is not applicable for whatever reason. */ 444 445 extern struct value *coerce_ref_if_computed (const struct value *arg); 446 447 /* Setup a new value type and enclosing value type for dereferenced value VALUE. 448 ENC_TYPE is the new enclosing type that should be set. ORIGINAL_TYPE and 449 ORIGINAL_VAL are the type and value of the original reference or pointer. 450 451 Note, that VALUE is modified by this function. 452 453 It is a common implementation for coerce_ref and value_ind. */ 454 455 extern struct value * readjust_indirect_value_type (struct value *value, 456 struct type *enc_type, 457 struct type *original_type, 458 struct value *original_val); 459 460 /* Convert a REF to the object referenced. */ 461 462 extern struct value *coerce_ref (struct value *value); 463 464 /* If ARG is an array, convert it to a pointer. 465 If ARG is a function, convert it to a function pointer. 466 467 References are dereferenced. */ 468 469 extern struct value *coerce_array (struct value *value); 470 471 /* Given a value, determine whether the bits starting at OFFSET and 472 extending for LENGTH bits are a synthetic pointer. */ 473 474 extern int value_bits_synthetic_pointer (const struct value *value, 475 int offset, int length); 476 477 /* Given a value, determine whether the contents bytes starting at 478 OFFSET and extending for LENGTH bytes are available. This returns 479 nonzero if all bytes in the given range are available, zero if any 480 byte is unavailable. */ 481 482 extern int value_bytes_available (const struct value *value, 483 int offset, int length); 484 485 /* Given a value, determine whether the contents bits starting at 486 OFFSET and extending for LENGTH bits are available. This returns 487 nonzero if all bits in the given range are available, zero if any 488 bit is unavailable. */ 489 490 extern int value_bits_available (const struct value *value, 491 int offset, int length); 492 493 /* Like value_bytes_available, but return false if any byte in the 494 whole object is unavailable. */ 495 extern int value_entirely_available (struct value *value); 496 497 /* Like value_entirely_available, but return false if any byte in the 498 whole object is available. */ 499 extern int value_entirely_unavailable (struct value *value); 500 501 /* Mark VALUE's content bytes starting at OFFSET and extending for 502 LENGTH bytes as unavailable. */ 503 504 extern void mark_value_bytes_unavailable (struct value *value, 505 int offset, int length); 506 507 /* Mark VALUE's content bits starting at OFFSET and extending for 508 LENGTH bits as unavailable. */ 509 510 extern void mark_value_bits_unavailable (struct value *value, 511 int offset, int length); 512 513 /* Compare LENGTH bytes of VAL1's contents starting at OFFSET1 with 514 LENGTH bytes of VAL2's contents starting at OFFSET2. 515 516 Note that "contents" refers to the whole value's contents 517 (value_contents_all), without any embedded offset adjustment. For 518 example, to compare a complete object value with itself, including 519 its enclosing type chunk, you'd do: 520 521 int len = TYPE_LENGTH (check_typedef (value_enclosing_type (val))); 522 value_contents_eq (val, 0, val, 0, len); 523 524 Returns true iff the set of available/valid contents match. 525 526 Optimized-out contents are equal to optimized-out contents, and are 527 not equal to non-optimized-out contents. 528 529 Unavailable contente are equal to unavailable contents, and are not 530 equal to non-unavailable contents. 531 532 For example, if 'x's represent an unavailable byte, and 'V' and 'Z' 533 represent different available/valid bytes, in a value with length 534 16: 535 536 offset: 0 4 8 12 16 537 contents: xxxxVVVVxxxxVVZZ 538 539 then: 540 541 value_contents_eq(val, 0, val, 8, 6) => 1 542 value_contents_eq(val, 0, val, 4, 4) => 0 543 value_contents_eq(val, 0, val, 8, 8) => 0 544 value_contents_eq(val, 4, val, 12, 2) => 1 545 value_contents_eq(val, 4, val, 12, 4) => 0 546 value_contents_eq(val, 3, val, 4, 4) => 0 547 548 If 'x's represent an unavailable byte, 'o' represents an optimized 549 out byte, in a value with length 8: 550 551 offset: 0 4 8 552 contents: xxxxoooo 553 554 then: 555 556 value_contents_eq(val, 0, val, 2, 2) => 1 557 value_contents_eq(val, 4, val, 6, 2) => 1 558 value_contents_eq(val, 0, val, 4, 4) => 0 559 560 We only know whether a value chunk is unavailable or optimized out 561 if we've tried to read it. As this routine is used by printing 562 routines, which may be printing values in the value history, long 563 after the inferior is gone, it works with const values. Therefore, 564 this routine must not be called with lazy values. */ 565 566 extern int value_contents_eq (const struct value *val1, int offset1, 567 const struct value *val2, int offset2, 568 int length); 569 570 /* Read LENGTH bytes of memory starting at MEMADDR into BUFFER, which 571 is (or will be copied to) VAL's contents buffer offset by 572 EMBEDDED_OFFSET (that is, to &VAL->contents[EMBEDDED_OFFSET]). 573 Marks value contents ranges as unavailable if the corresponding 574 memory is likewise unavailable. STACK indicates whether the memory 575 is known to be stack memory. */ 576 577 extern void read_value_memory (struct value *val, int embedded_offset, 578 int stack, CORE_ADDR memaddr, 579 gdb_byte *buffer, size_t length); 580 581 /* Cast SCALAR_VALUE to the element type of VECTOR_TYPE, then replicate 582 into each element of a new vector value with VECTOR_TYPE. */ 583 584 struct value *value_vector_widen (struct value *scalar_value, 585 struct type *vector_type); 586 587 588 590 #include "symtab.h" 591 #include "gdbtypes.h" 592 #include "expression.h" 593 594 struct frame_info; 595 struct fn_field; 596 597 extern int print_address_demangle (const struct value_print_options *, 598 struct gdbarch *, CORE_ADDR, 599 struct ui_file *, int); 600 601 extern LONGEST value_as_long (struct value *val); 602 extern DOUBLEST value_as_double (struct value *val); 603 extern CORE_ADDR value_as_address (struct value *val); 604 605 extern LONGEST unpack_long (struct type *type, const gdb_byte *valaddr); 606 extern DOUBLEST unpack_double (struct type *type, const gdb_byte *valaddr, 607 int *invp); 608 extern CORE_ADDR unpack_pointer (struct type *type, const gdb_byte *valaddr); 609 610 extern LONGEST unpack_field_as_long (struct type *type, 611 const gdb_byte *valaddr, 612 int fieldno); 613 extern int unpack_value_field_as_long (struct type *type, const gdb_byte *valaddr, 614 int embedded_offset, int fieldno, 615 const struct value *val, LONGEST *result); 616 617 extern void unpack_value_bitfield (struct value *dest_val, 618 int bitpos, int bitsize, 619 const gdb_byte *valaddr, int embedded_offset, 620 const struct value *val); 621 622 extern struct value *value_field_bitfield (struct type *type, int fieldno, 623 const gdb_byte *valaddr, 624 int embedded_offset, 625 const struct value *val); 626 627 extern void pack_long (gdb_byte *buf, struct type *type, LONGEST num); 628 629 extern struct value *value_from_longest (struct type *type, LONGEST num); 630 extern struct value *value_from_ulongest (struct type *type, ULONGEST num); 631 extern struct value *value_from_pointer (struct type *type, CORE_ADDR addr); 632 extern struct value *value_from_double (struct type *type, DOUBLEST num); 633 extern struct value *value_from_decfloat (struct type *type, 634 const gdb_byte *decbytes); 635 extern struct value *value_from_history_ref (const char *, const char **); 636 637 extern struct value *value_at (struct type *type, CORE_ADDR addr); 638 extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr); 639 640 extern struct value *value_from_contents_and_address_unresolved 641 (struct type *, const gdb_byte *, CORE_ADDR); 642 extern struct value *value_from_contents_and_address (struct type *, 643 const gdb_byte *, 644 CORE_ADDR); 645 extern struct value *value_from_contents (struct type *, const gdb_byte *); 646 647 extern struct value *default_value_from_register (struct gdbarch *gdbarch, 648 struct type *type, 649 int regnum, 650 struct frame_id frame_id); 651 652 extern void read_frame_register_value (struct value *value, 653 struct frame_info *frame); 654 655 extern struct value *value_from_register (struct type *type, int regnum, 656 struct frame_info *frame); 657 658 extern CORE_ADDR address_from_register (int regnum, 659 struct frame_info *frame); 660 661 extern struct value *value_of_variable (struct symbol *var, 662 const struct block *b); 663 664 extern struct value *address_of_variable (struct symbol *var, 665 const struct block *b); 666 667 extern struct value *value_of_register (int regnum, struct frame_info *frame); 668 669 struct value *value_of_register_lazy (struct frame_info *frame, int regnum); 670 671 extern int symbol_read_needs_frame (struct symbol *); 672 673 extern struct value *read_var_value (struct symbol *var, 674 struct frame_info *frame); 675 676 extern struct value *default_read_var_value (struct symbol *var, 677 struct frame_info *frame); 678 679 extern struct value *allocate_value (struct type *type); 680 extern struct value *allocate_value_lazy (struct type *type); 681 extern void value_contents_copy (struct value *dst, int dst_offset, 682 struct value *src, int src_offset, 683 int length); 684 extern void value_contents_copy_raw (struct value *dst, int dst_offset, 685 struct value *src, int src_offset, 686 int length); 687 688 extern struct value *allocate_repeat_value (struct type *type, int count); 689 690 extern struct value *value_mark (void); 691 692 extern void value_free_to_mark (struct value *mark); 693 694 extern struct value *value_cstring (char *ptr, ssize_t len, 695 struct type *char_type); 696 extern struct value *value_string (char *ptr, ssize_t len, 697 struct type *char_type); 698 699 extern struct value *value_array (int lowbound, int highbound, 700 struct value **elemvec); 701 702 extern struct value *value_concat (struct value *arg1, struct value *arg2); 703 704 extern struct value *value_binop (struct value *arg1, struct value *arg2, 705 enum exp_opcode op); 706 707 extern struct value *value_ptradd (struct value *arg1, LONGEST arg2); 708 709 extern LONGEST value_ptrdiff (struct value *arg1, struct value *arg2); 710 711 extern int value_must_coerce_to_target (struct value *arg1); 712 713 extern struct value *value_coerce_to_target (struct value *arg1); 714 715 extern struct value *value_coerce_array (struct value *arg1); 716 717 extern struct value *value_coerce_function (struct value *arg1); 718 719 extern struct value *value_ind (struct value *arg1); 720 721 extern struct value *value_addr (struct value *arg1); 722 723 extern struct value *value_ref (struct value *arg1); 724 725 extern struct value *value_assign (struct value *toval, 726 struct value *fromval); 727 728 extern struct value *value_pos (struct value *arg1); 729 730 extern struct value *value_neg (struct value *arg1); 731 732 extern struct value *value_complement (struct value *arg1); 733 734 extern struct value *value_struct_elt (struct value **argp, 735 struct value **args, 736 const char *name, int *static_memfuncp, 737 const char *err); 738 739 extern struct value *value_struct_elt_bitpos (struct value **argp, 740 int bitpos, 741 struct type *field_type, 742 const char *err); 743 744 extern struct value *value_aggregate_elt (struct type *curtype, 745 const char *name, 746 struct type *expect_type, 747 int want_address, 748 enum noside noside); 749 750 extern struct value *value_static_field (struct type *type, int fieldno); 751 752 enum oload_search_type { NON_METHOD, METHOD, BOTH }; 753 754 extern int find_overload_match (struct value **args, int nargs, 755 const char *name, 756 enum oload_search_type method, 757 struct value **objp, struct symbol *fsym, 758 struct value **valp, struct symbol **symp, 759 int *staticp, const int no_adl, 760 enum noside noside); 761 762 extern struct value *value_field (struct value *arg1, int fieldno); 763 764 extern struct value *value_primitive_field (struct value *arg1, int offset, 765 int fieldno, 766 struct type *arg_type); 767 768 769 extern struct type *value_rtti_indirect_type (struct value *, int *, int *, 770 int *); 771 772 extern struct value *value_full_object (struct value *, struct type *, int, 773 int, int); 774 775 extern struct value *value_cast_pointers (struct type *, struct value *, int); 776 777 extern struct value *value_cast (struct type *type, struct value *arg2); 778 779 extern struct value *value_reinterpret_cast (struct type *type, 780 struct value *arg); 781 782 extern struct value *value_dynamic_cast (struct type *type, struct value *arg); 783 784 extern struct value *value_zero (struct type *type, enum lval_type lv); 785 786 extern struct value *value_one (struct type *type); 787 788 extern struct value *value_repeat (struct value *arg1, int count); 789 790 extern struct value *value_subscript (struct value *array, LONGEST index); 791 792 extern struct value *value_bitstring_subscript (struct type *type, 793 struct value *bitstring, 794 LONGEST index); 795 796 extern struct value *register_value_being_returned (struct type *valtype, 797 struct regcache *retbuf); 798 799 extern int value_in (struct value *element, struct value *set); 800 801 extern int value_bit_index (struct type *type, const gdb_byte *addr, 802 int index); 803 804 extern enum return_value_convention 805 struct_return_convention (struct gdbarch *gdbarch, struct value *function, 806 struct type *value_type); 807 808 extern int using_struct_return (struct gdbarch *gdbarch, 809 struct value *function, 810 struct type *value_type); 811 812 extern struct value *evaluate_expression (struct expression *exp); 813 814 extern struct value *evaluate_type (struct expression *exp); 815 816 extern struct value *evaluate_subexp (struct type *expect_type, 817 struct expression *exp, 818 int *pos, enum noside noside); 819 820 extern struct value *evaluate_subexpression_type (struct expression *exp, 821 int subexp); 822 823 extern void fetch_subexp_value (struct expression *exp, int *pc, 824 struct value **valp, struct value **resultp, 825 struct value **val_chain, 826 int preserve_errors); 827 828 extern char *extract_field_op (struct expression *exp, int *subexp); 829 830 extern struct value *evaluate_subexp_with_coercion (struct expression *, 831 int *, enum noside); 832 833 extern struct value *parse_and_eval (const char *exp); 834 835 extern struct value *parse_to_comma_and_eval (const char **expp); 836 837 extern struct type *parse_and_eval_type (char *p, int length); 838 839 extern CORE_ADDR parse_and_eval_address (const char *exp); 840 841 extern LONGEST parse_and_eval_long (const char *exp); 842 843 extern void unop_promote (const struct language_defn *language, 844 struct gdbarch *gdbarch, 845 struct value **arg1); 846 847 extern void binop_promote (const struct language_defn *language, 848 struct gdbarch *gdbarch, 849 struct value **arg1, struct value **arg2); 850 851 extern struct value *access_value_history (int num); 852 853 extern struct value *value_of_internalvar (struct gdbarch *gdbarch, 854 struct internalvar *var); 855 856 extern int get_internalvar_integer (struct internalvar *var, LONGEST *l); 857 858 extern void set_internalvar (struct internalvar *var, struct value *val); 859 860 extern void set_internalvar_integer (struct internalvar *var, LONGEST l); 861 862 extern void set_internalvar_string (struct internalvar *var, 863 const char *string); 864 865 extern void clear_internalvar (struct internalvar *var); 866 867 extern void set_internalvar_component (struct internalvar *var, 868 int offset, 869 int bitpos, int bitsize, 870 struct value *newvalue); 871 872 extern struct internalvar *lookup_only_internalvar (const char *name); 873 874 extern struct internalvar *create_internalvar (const char *name); 875 876 extern VEC (char_ptr) *complete_internalvar (const char *name); 877 878 /* An internalvar can be dynamically computed by supplying a vector of 879 function pointers to perform various operations. */ 880 881 struct internalvar_funcs 882 { 883 /* Compute the value of the variable. The DATA argument passed to 884 the function is the same argument that was passed to 885 `create_internalvar_type_lazy'. */ 886 887 struct value *(*make_value) (struct gdbarch *arch, 888 struct internalvar *var, 889 void *data); 890 891 /* Update the agent expression EXPR with bytecode to compute the 892 value. VALUE is the agent value we are updating. The DATA 893 argument passed to this function is the same argument that was 894 passed to `create_internalvar_type_lazy'. If this pointer is 895 NULL, then the internalvar cannot be compiled to an agent 896 expression. */ 897 898 void (*compile_to_ax) (struct internalvar *var, 899 struct agent_expr *expr, 900 struct axs_value *value, 901 void *data); 902 903 /* If non-NULL, this is called to destroy DATA. The DATA argument 904 passed to this function is the same argument that was passed to 905 `create_internalvar_type_lazy'. */ 906 907 void (*destroy) (void *data); 908 }; 909 910 extern struct internalvar *create_internalvar_type_lazy (const char *name, 911 const struct internalvar_funcs *funcs, 912 void *data); 913 914 /* Compile an internal variable to an agent expression. VAR is the 915 variable to compile; EXPR and VALUE are the agent expression we are 916 updating. This will return 0 if there is no known way to compile 917 VAR, and 1 if VAR was successfully compiled. It may also throw an 918 exception on error. */ 919 920 extern int compile_internalvar_to_ax (struct internalvar *var, 921 struct agent_expr *expr, 922 struct axs_value *value); 923 924 extern struct internalvar *lookup_internalvar (const char *name); 925 926 extern int value_equal (struct value *arg1, struct value *arg2); 927 928 extern int value_equal_contents (struct value *arg1, struct value *arg2); 929 930 extern int value_less (struct value *arg1, struct value *arg2); 931 932 extern int value_logical_not (struct value *arg1); 933 934 /* C++ */ 935 936 extern struct value *value_of_this (const struct language_defn *lang); 937 938 extern struct value *value_of_this_silent (const struct language_defn *lang); 939 940 extern struct value *value_x_binop (struct value *arg1, struct value *arg2, 941 enum exp_opcode op, 942 enum exp_opcode otherop, 943 enum noside noside); 944 945 extern struct value *value_x_unop (struct value *arg1, enum exp_opcode op, 946 enum noside noside); 947 948 extern struct value *value_fn_field (struct value **arg1p, struct fn_field *f, 949 int j, struct type *type, int offset); 950 951 extern int binop_types_user_defined_p (enum exp_opcode op, 952 struct type *type1, 953 struct type *type2); 954 955 extern int binop_user_defined_p (enum exp_opcode op, struct value *arg1, 956 struct value *arg2); 957 958 extern int unop_user_defined_p (enum exp_opcode op, struct value *arg1); 959 960 extern int destructor_name_p (const char *name, struct type *type); 961 962 extern void value_incref (struct value *val); 963 964 extern void value_free (struct value *val); 965 966 extern void free_all_values (void); 967 968 extern void free_value_chain (struct value *v); 969 970 extern void release_value (struct value *val); 971 972 extern void release_value_or_incref (struct value *val); 973 974 extern int record_latest_value (struct value *val); 975 976 extern void modify_field (struct type *type, gdb_byte *addr, 977 LONGEST fieldval, int bitpos, int bitsize); 978 979 extern void type_print (struct type *type, const char *varstring, 980 struct ui_file *stream, int show); 981 982 extern char *type_to_string (struct type *type); 983 984 extern gdb_byte *baseclass_addr (struct type *type, int index, 985 gdb_byte *valaddr, 986 struct value **valuep, int *errp); 987 988 extern void print_longest (struct ui_file *stream, int format, 989 int use_local, LONGEST val); 990 991 extern void print_floating (const gdb_byte *valaddr, struct type *type, 992 struct ui_file *stream); 993 994 extern void print_decimal_floating (const gdb_byte *valaddr, struct type *type, 995 struct ui_file *stream); 996 997 extern void value_print (struct value *val, struct ui_file *stream, 998 const struct value_print_options *options); 999 1000 extern void value_print_array_elements (struct value *val, 1001 struct ui_file *stream, int format, 1002 enum val_prettyformat pretty); 1003 1004 extern struct value *value_release_to_mark (struct value *mark); 1005 1006 extern void val_print (struct type *type, const gdb_byte *valaddr, 1007 int embedded_offset, CORE_ADDR address, 1008 struct ui_file *stream, int recurse, 1009 const struct value *val, 1010 const struct value_print_options *options, 1011 const struct language_defn *language); 1012 1013 extern void common_val_print (struct value *val, 1014 struct ui_file *stream, int recurse, 1015 const struct value_print_options *options, 1016 const struct language_defn *language); 1017 1018 extern int val_print_string (struct type *elttype, const char *encoding, 1019 CORE_ADDR addr, int len, 1020 struct ui_file *stream, 1021 const struct value_print_options *options); 1022 1023 extern void print_variable_and_value (const char *name, 1024 struct symbol *var, 1025 struct frame_info *frame, 1026 struct ui_file *stream, 1027 int indent); 1028 1029 extern void typedef_print (struct type *type, struct symbol *news, 1030 struct ui_file *stream); 1031 1032 extern char *internalvar_name (struct internalvar *var); 1033 1034 extern void preserve_values (struct objfile *); 1035 1036 /* From values.c */ 1037 1038 extern struct value *value_copy (struct value *); 1039 1040 extern struct value *value_non_lval (struct value *); 1041 1042 extern void value_force_lval (struct value *, CORE_ADDR); 1043 1044 extern struct value *make_cv_value (int, int, struct value *); 1045 1046 extern void preserve_one_value (struct value *, struct objfile *, htab_t); 1047 1048 /* From valops.c */ 1049 1050 extern struct value *varying_to_slice (struct value *); 1051 1052 extern struct value *value_slice (struct value *, int, int); 1053 1054 extern struct value *value_literal_complex (struct value *, struct value *, 1055 struct type *); 1056 1057 extern struct value *find_function_in_inferior (const char *, 1058 struct objfile **); 1059 1060 extern struct value *value_allocate_space_in_inferior (int); 1061 1062 extern struct value *value_subscripted_rvalue (struct value *array, 1063 LONGEST index, int lowerbound); 1064 1065 /* User function handler. */ 1066 1067 typedef struct value *(*internal_function_fn) (struct gdbarch *gdbarch, 1068 const struct language_defn *language, 1069 void *cookie, 1070 int argc, 1071 struct value **argv); 1072 1073 void add_internal_function (const char *name, const char *doc, 1074 internal_function_fn handler, 1075 void *cookie); 1076 1077 struct value *call_internal_function (struct gdbarch *gdbarch, 1078 const struct language_defn *language, 1079 struct value *function, 1080 int argc, struct value **argv); 1081 1082 char *value_internal_function_name (struct value *); 1083 1084 extern struct value *value_of_xmethod (struct xmethod_worker *); 1085 1086 extern struct type *result_type_of_xmethod (struct value *method, 1087 int argc, struct value **argv); 1088 1089 extern struct value *call_xmethod (struct value *method, 1090 int argc, struct value **argv); 1091 1092 #endif /* !defined (VALUE_H) */ 1093
Indexes created Sun Mar 01 05:31:48 UTC 2026